It might help a little, but I doubt it will make much difference. Check the Consumer Reports ratings on Air Purifiers. Anything that is in that price range generally won't do a good job at dust removal. I see that it has a lot of great ratings, however, so it might be worth a try.

Note that the good ones tend to be noisy because they move a lot of air around. And the one I had (an Envirocare/Honeywell) tended to warm up the room because the motor puts out heat. -- Edited on 11/24/12 3:52 PM --

It doesn't have to be in that price range; I just linked to that picture as an example. What kind do you use? What should I look for when buying one? What type of filter? -- Edited on 11/24/12 4:01 PM --

If it's the right size for the room, yes, it will reduce dust. I used a Honeywell with HEPA filter in a small-ish bedroom for a time, when I had terrible allergies. I was using it for my allergies, and was pleasantly surprised to find that it also dusted my room for me. But it was a small room and a medium air filter. It would definitely have to be the right size. The one I had cost about $170, somewhere in that ballpark.

This is the one that I bought (cheaper, too, than what I paid - - I didn't buy it from Amazon). You can even see the filters below the description of it. They're some sort of roll of carbon. The replacement filters are cheap, so it's just the initial expense. There's one other thing to consider: it increases the electric bill. In my case, it was about $20-25 more per month. I imagine that amount could vary widely across the country. At any rate - - I was very pleased with it. I still pull it out and use it during bad pollen season times. It also freshens the air. -- Edited on 11/26/12 6:20 PM --

I have two Venta filters, that use water to clean the air... in the winter, they also act as gentle humidifiers. They are rather expensive but work really well, made in Germany. Also have several HEPA filters, bought at Target for about $60-80. We still have a lot of dust around-- live in an old, dusty house-- but it's much better with the filters than without.

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